BS 4449-2009 Steel for the reinforcement of concrete — Weldable reinforcing steel — Bar,coil and decoiled product —Specification

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BRITISHSTANDARDBS4449:2005+A2:2009Steelforthereinforcementofconcrete—Weldablereinforcingsteel—Bar,coilanddecoiledproduct—SpecificationICS77.140.15;91.080.40  BS4449:2005+A2:2009CommitteesresponsibleforthisBritishStandardThepreparationofthisBritishStandardwasentrustedbyTechnicalCommitteeISE/9,Steelforconcretereinforcement,toSubcommitteeISE/9/1,Bars,wireandfabricforconcretereinforcement,uponwhichthefollowingbodieswererepresented:BritishCoatingsFederationBritishPrecastConcreteFederationConcreteSocietyDepartmentofTransport—HighwaysAgencyGalvanizersAssociationInstitutionofStructuralEngineersUKCertificationAuthorityforReinforcingSteelsUKSteelAssociationThisBritishStandardwaspublishedundertheauthorityoftheStandardsPolicyandStrategyCommitteeon30September2005©BSI2009Firstpublished:BS4449:April1969BS4461:March1969Firstrevision:BS4449:May1978BS4461:May1978Secondcombinedversionas:BS4449:May1988AmendmentsissuedsincepublicationThirdcombinedversionas:BS4449:May1997Amd.No.DateCommentsThefollowingBSIreferences1710330April2007SeeforewordrelatetotheworkonthisBritishStandard:Amd.231March2009SeeforewordCommitteereferenceISE/9/1Draftforcomment04/30109891DCISBN9780580645853 BS4449:2005+A2:2009ContentsPageCommitteesresponsibleInsidefrontcoverForewordii1Scope12Normativereferences13Termsanddefinitions14Symbols35Designations36Steelmakingandmanufacturingprocesses37Productcharacteristics58Evaluationofconformity109Testmethods1310Identification1311Verificationofpropertiesinthecaseofdispute15AnnexA(normative)Bondtestforribbedreinforcingsteel—Beamtest16AnnexB(normative)Materialnotcoveredbyathirdpartyproductcertificationscheme23AnnexC(normative)Identificationrequirements25Bibliography27Figure1—Ribgeometryexamplewithtworowsoftransverseribs9Figure2—ExampleofribpatternforgradeB500A14Figure3—ExampleofribpatternforgradeB500B14Figure4—ExampleofribpatternforgradeB500C14FigureA.1—DimensionsofthehingeforbeamtypeA(d<16mm)16FigureA.2—DimensionsofthehingeforbeamtypeB(dW16mm)17FigureA.3—BeamtesttypeA(d<16mm)17FigureA.4—BeamtesttypeB(dW16mm)18FigureA.5—BondtesttypeA(d<16mm)—Reinforcementofbeamspecimens20FigureA.6—BondtesttypeB(dW16mm)—Reinforcementofbeamspecimens21FigureC.1—Exampleofmanufacturer’sidentificationmark(usingwidenedribs)25Table1—Listofsymbols4Table2—Chemicalcomposition(maximum%bymass)5Table3—Conditionsoftestingthemechanicalproperties5Table4—Characteristictensileproperties6Table5—Fatiguetestconditions6Table6—Mandreldiametersforrebendtest7Table7—Nominalcross-sectionalareaandmasspermetre8Table8—Rangesfortheribparameters9Table9—Characteristicrelativeribarea9Table10—Absoluteminimumandmaximumvaluesoftensileproperties11Table11—Coefficientkasafunctionofthenumbernoftestresults(forareliablefailurerateof5%[p=0.95]ataprobabilityof90%)12Table12—Coefficientkasafunctionofthenumbernoftestresults(forareliablefailurerateof10%[p=0.90]ataprobabilityof90%)13TableA.1—Seriesofreinforcingsteeldiametersfortestingofbond18TableC.1—Identificationofthecountryoforigin26©BSI2009i BS4449:2005+A2:2009ForewordThisBritishStandardhasbeenpreparedbySubcommitteeISE/9/1.BS4449:2005+A2:2009supersedesBS4449:2005+A1:2007,whichiswithdrawn.Thiseditionincorporatesafullrevisionofthestandard.Thecharacteristicyieldstrengthhasbeenincreasedto500MPa,andathirdductilityclasshasbeenadded,comparedtoBS4449:1997.ThestartandfinishoftextintroducedbyAmendmentNo.1andNo.2isindicatedinthetextbytags!"and#$.Thisstandardnolongercoversplainroundbar.Forsizesuptoandincluding12mmincoil,plainroundwireofgrade250MPahasbeenincorporatedintoBS4482.Forlargersizes,fordowelbarapplications,referenceshouldbemadetoBSEN10025-1.Fordowelbarsforuseinconcretepavements,referenceshouldbemadetoBSEN13877-3.ThisstandardhasbeenwrittensothatitcanbeusedinconjunctionwithBSEN10080:2005.Definitions,symbols,steelmakingandmanufacturingprocesses,routineinspectionandtesting,testmethods,identificationofthemanufacturerandtechnicalclassandverificationofmechanicalpropertiesinthecaseofdisputearealltakenfromBSEN10080:2005.BSEN10080:2005doesnotdefinesteelgradesortechnicalclasses,andrequiresthattechnicalclassesshouldbedefinedinaccordancewithBSEN10080:2005,byspecifiedvaluesofRe,Rm/Re,Agt,Re,act/Re,nom(whereappropriate),fatiguestrength,bendperformance,weldability,bondstrength,tolerancesanddimensions.ThethreesteelgradesinthisstandardconformtoalloftherequirementsofBSEN10080:2005.ThethreegradesinthisstandardalsoconformtothethreerecommendedductilityclassesofBSEN1992-1-1:2004,althoughthefatiguerequirementsandthefatiguetestconditionsareretainedfromthepreviousversionofthisstandard.TheonlyexceptiontothisisforgradeB500Ainsizesbelow8mm,wheretheductilityrequirementsspecifiedarebelowthoseofBSEN1992-1-1:2004.!Inthepreviousrevisionofthisstandard,bondwasspecifiedbymeansofaprojectedribarea,withapull-outtestspecifiedasanalternativemeansofdemonstratingcompliancewiththebondrequirementsofBS8110-1.Inthisrevision,bondisspecifiedbymeansofarelativeribarea.Asanalternative,abeamtestisprovidedinAnnexA,whichmaybeusedtodemonstratecompliancewithEurocode2.WhereanalternativebondtestisrequiredtodemonstratecompliancewithBS8110-1,thenthepull-outtestmaybeused.Thispull-outtestalternativemayonlybeappliedtosteelsofgradeB500A."BSEN10080:2005containsaninformativeAnnexZA,whichdescribeshowthatstandardcanbeusedforthepurposesofCEmarkingofreinforcingsteels.AnnexZAand8.2,8.3and8.4ofBSEN10080:2005relatetotheroleofthenotifiedbodyinassessingproductsforanECcertificateofconformity,andassucharenotincludedinthisstandard.ItisnotarequirementofthisBritishStandardthatmaterialsproducedtoitshouldmeettherequirementsforCEmarking.WhereCEmarkingisrequiredforthepurposesofcomplyingwiththeEUConstructionProductsDirective,BSEN10080:2005applies.Itisrecommendedthatpurchasersspecifyreinforcingsteelthathasbeenmanufacturedandsuppliedtoarecognizedthirdpartyproductcertificationscheme.8.2specifiesthedeterminationofthelongtermqualitylevelundersuchascheme.Asanalternative,AnnexBprovidesabatchtestingmethodformaterialwhichhasnotbeenproducedundersuchascheme.InBSEN10080,theterms“rod”and“wire”areusedtodescribereinforcingsteelincoil.Inthisstandard,thesetermshavenotbeenincludedtoavoidthepotentialforconfusion,particularlywithwireproducedtoBS4482.Thisstandardcomesintoeffecton1January2006.ii©BSI2009 BS4449:2005+A2:2009Thispublicationdoesnotpurporttoincludeallthenecessaryprovisionsofacontract.Usersareresponsibleforitscorrectapplication.CompliancewithaBritishStandardcannotconferimmunityfromlegalobligations.SummaryofpagesThisdocumentcomprisesafrontcover,aninsidefrontcover,pagesitoiii,ablankpage,pages1to27andabackcover.TheBSIcopyrightnoticedisplayedinthisdocumentindicateswhenthedocumentwaslastissued.©BSI2009iii blank BS4449:2005+A2:20091ScopeThisBritishStandardspecifiesrequirementsforribbedweldablereinforcingsteelusedforthereinforcementofconcretestructures.Thestandardcoverssteeldeliveredintheformofbars,coilsanddecoiledproducts.Thestandardcontainsprovisionsforthreesteelgrades,allof500MPacharacteristicyieldstrength,butwithdifferentductilitycharacteristics.ThethreegradesareB500A,B500BandB500C.Theweldabilityrequirementsforallgradesofsteelarespecifiedintermsofthechemicalcomposition,andinparticularthecarbonequivalentvalue.Steelbarsproducedbyre-rollingfinishedproducts,orbyrollingmaterialofwhichthemetallurgicalhistoryisnotfullydocumentedornotknown,arenotcoveredbythisBritishStandard.NOTEFlashweldsinlengthsofbararepermissibleunderthisstandard,providedallthemechanicalrequirementsaremet.However,forsomepurposes,purchasersmightspecificallyrequirebarswithoutflashwelds,andifsothisoughttobestatedatthetimeofenquiryand/ororder.2NormativereferencesThefollowingreferenceddocumentsareindispensablefortheapplicationofthisdocument.Fordatedreferences,onlytheeditioncitedapplies.Forundatedreferences,thelatesteditionofthereferenceddocument(includinganyamendments)applies.BSEN1766:2000,Productsandsystemsfortheprotectionandrepairofconcretestructures—Testmethods—Referenceconcretesfortesting.BSEN10020,Definitionandclassificationofgradesofsteel.BSEN10025-1,Hotrolledproductsofstructuralsteels—Generaltechnicaldeliveryconditions.BSEN10079,Definitionofsteelproducts.BSEN10080:2005,Steelforthereinforcementofconcrete—Weldablereinforcingsteel—General.BSEN12390-3,Testinghardenedconcrete—Part3:Compressivestrengthoftestspecimens.BSENISO15630-1:2002,Steelforthereinforcementandprestressingofconcrete—Testmethods—Part1:Reinforcingbars,wirerodandwires.3TermsanddefinitionsForthepurposesofthisBritishStandardthedefinitionsinBSEN10020andBSEN10079apply,inadditiontothefollowingdefinitionstakenfromBSEN10080:2005.3.1reinforcingsteelsteelproductwithacircularorpracticallycircularcross-sectionwhichissuitableforthereinforcementofconcreteNOTEThereinforcingsteelsspecifiedusingthisstandardarebar,coilanddecoiledproduct.3.2ribbedreinforcingsteelreinforcingsteelwithatleasttworowsoftransverseribs,whichareuniformlydistributedovertheentirelength3.3longitudinalribuniformcontinuousprotrusionparalleltotheaxisofthereinforcingsteel3.4transverseribribonthesurfaceofthereinforcingsteelotherthanalongitudinalrib©BSI20091 BS4449:2005+A2:20093.5ribheighthdistancefromthehighestpointoftherib(transverseorlongitudinal)tothesurfaceofthecore,tobemeasurednormaltotheaxisofthereinforcingsteel3.6ribspacingcdistancebetweenthecentresoftwoconsecutivetransverseribsmeasuredparalleltotheaxisofthereinforcingsteel3.7angleoftransverseribinclination¶anglebetweentheaxisofthetransverseribandthelongitudinalaxisofthereinforcingsteel3.8transverseribflankinclinationµangleoftheribflankmeasuredperpendiculartothelongitudinalaxisoftheribNOTESeeFigure1.3.9relativeribareafRareaoftheprojectionofallribsonaplaneperpendiculartothelongitudinalaxisofthereinforcingsteeldividedbytheribspacingandthenominalcircumference3.10barribbedreinforcingsteelmanufacturedinstraightlengths3.11coilsinglelengthofreinforcingsteelwoundinconcentricrings3.12decoiledproductreinforcingsteelmanufacturedincoilsandsubsequentlystraightenedforfurtherprocessing3.13nominalcross-sectionalareaAn2Ïdcross-sectionalareaequivalenttotheareaofacircularplainbarofthesamenominaldiameter,d(i.e.----------)43.14characteristicvaluevalueofamaterialorproductpropertyhavingaprescribedprobabilityofnotbeingattainedinahypotheticalunlimitedtestseriesNOTE1Thisvaluegenerallycorrespondstoaspecificfractileoftheassumedstatisticaldistributionoftheparticularpropertyofthematerialorproduct.3.15minimumvaluevaluebelowwhichnotestresultshallfall2©BSI2009 BS4449:2005+A2:20093.16maximumvaluevaluewhichnotestresultshallexceed3.17batchquantityofbars,coils,ordecoiledproductsofonenominaldiameterandonecastproducedbyonemanufacturerandpresentedforexaminationatanyonetime3.18standardpropertypropertywhichispartoftheroutineinspectionandtestrequirementsforeverytestunit3.19specialpropertypropertywhichisnotdeterminedaspartoftheroutineinspectionandtestrequirementsforeverytestunit(e.g.fatigueperformance)3.20technicalclasstypeofreinforcingsteeldefinedbyitsperformancecharacteristics,identifiedbyauniqueproductnumber4SymbolsAlistofsymbolsusedinthisstandard,reproducedfromBSEN10080:2005,isgiveninTable1.5DesignationsTheproductscoveredbythisstandardshallbedesignatedwiththefollowinginformation:a)descriptionoftheproductform(i.e.bar,coil,decoiledproduct);b)thenominaldimensionsoftheproduct;c)referencetothisstandard,andthegrade.Forexample,thedesignationfor40mmdiameterbarin12mlengthsofgradeB500Bwouldbe:“Bar40×12000BS4449GradeB500B”.WhereproductsthatconformtothisstandardarealsorequiredtomeetalloftherequirementsofBSEN10080:2005,forexampleforthepurposesofCEmarking,thenreferencetothisstandardshouldalsobemadeinthedesignation.Forexample,thedesignationofthe40mmbardescribedabovewouldbe:“BarBSEN1008040×12000BS4449GradeB500B”.6SteelmakingandmanufacturingprocessesThemeltingprocessandtypeofdeoxidationofthesteelshallbeatthediscretionofthesteelproducer.Themanufacturingprocessfortheproductionofcoilsandbarsshallbeatthediscretionofthemanufacturer.Itshallbereportedtothepurchaser.Decoilingofcoilmaterialshallbedonebyamachinemadeforthispurpose.©BSI20093 BS4449:2005+A2:2009Table1—ListofsymbolsSymbolDescriptionUnitANominalcross-sectionalareamm2nAgtPercentagetotalelongationatmaximumforce%cTransverseribspacingmmCeqCarbonequivalentvalue(CEV)%bymassCSpecifiedcharacteristicvalueavdNominaldiameterofthereinforcingsteelmmeGapbetweenribrowsmmfRRelativeribarea—hRibheightmmkCoefficientasafunctionofthenumberoftestresults—xAveragevalueoftestresultsaRYieldstrengthMPabeRUpperyieldstrengthMPabeHRTensilestrengthMPabmRm/ReRatiotensilestrength/yieldstrength—R0.2%proofstrength,nonproportionalextensionMPabp0.2sEstimateofthestandarddeviationaµTransverseribflankinclinationdegrees¶Angleoftransverseribinclinationdegrees2ÖStressrangeintheaxialloadfatiguetestMPabaÖSpecifiedmaximumstressinthefatiguetestMPabmaxÖSpecifiedminimumstressinthefatiguetestMPabminRActualvalueofyieldstrengthMPabe,actRSpecifiedvalueofyieldstrengthMPabe,nomRe,act/Re,nomRatioactualvalueofyieldstrength/specifiedvalueofyieldstrength—a,a,a,aIncrementforcalculationofbatchreleasecriteriaa1234bWidthofthebeam(beamtest)mmdmMandreldiameter(beamtest)mmFaTotalforceapplied(beamtest)kNFiForceinhingeandbarorwire(beamtest)kNÖStressinthebarorwire(beamtest)MPabsÙBondstress(beamtest)MPabbÙBondstressatmaximumforce(beamtest)MPabbuÙ,Ù,ÙBondstressat0.01mm,0.1mmand1mmslip(beamtest)MPab0.010.11aTheunitdependsontheproperty.b1MPa=1N/mm2.4©BSI2009 BS4449:2005+A2:20097Productcharacteristics7.1ChemicalcompositionThevaluesofindividualelementsandthecarbonequivalentshallnotexceedthelimitsgiveninTable2.ThecarbonequivalentvalueCeqshallbecalculatedusingthefollowingformula:MnCr++MoVNi+CuC=C++------------------------------------------+----------------------eq6515whereMnisthepercentagemanganesecontent;Cristhepercentagechromiumcontent;Visthepercentagevanadiumcontent;Moisthepercentagemolybdenumcontent;Cuisthepercentagecoppercontent;Niisthepercentagenickelcontent.Table2—Chemicalcomposition(maximum%bymass)CarbonaSulphurPhosphorusNitrogenbCopperCarbonequivalentCastanalysis0.220.050.050.0120.800.50Productanalysis0.240.0550.0550.0140.850.52aItispermittedtoexceedthemaximumvaluesofcarbonby0.03%bymass,providedthatthecarbonequivalentvalueisdecreasedby0.02%bymass.bHighernitrogencontentsarepermissibleifsufficientquantitiesofnitrogenbindingelementsarepresent.Duringproductanalysis,anybarthatfallsoutsidethemaximumspecifiedlimitsinTable2shallbedeemednottoconformtothisBritishStandard.Incasesofdispute,whereaproductanalysisfallsoutsidethemaximumlimitsspecifiedinTable2,theproceduredefinedin11.2shallbeappliedtodeterminewhetherthematerialconformstothisstandard.7.2Mechanicalproperties!NOTEBars,coilsandde-coiledproductsshouldbefreefromfeaturessuchasseams,porosity,segregationandnon-metallicinclusions,etc.,wheretheywouldcausetheproducttofailtomeetthespecifiedmechanicalproperties."7.2.1GeneralThecharacteristicvalueis(unlessotherwiseindicated)thelowerorupperlimitofthestatisticaltoleranceintervalatwhichthereisa90%probability(1-µ=0.90)that95%(p=0.95)or90%(p=0.90)ofthevaluesareatorabovethelowerlimitoratorbelowtheupperlimitrespectively.Thisqualitylevelreferstothelong-termqualitylevelofproduction.7.2.2ConditionsoftestingTheconditionsoftestingshallconformtoTable3.Table3—ConditionsoftestingthemechanicalpropertiesManufacturinganddeliveryconditionConditionoftestingProducedinstraightlengthsbyhotrollingAsdeliveredaoragedbProducedinstraightlengthsbycoldworkingAgedbProducedascoilanddelivereddecoiledAgedbProducedanddeliveredascoilAgedbaAgedinthecaseofdispute.bAgingmethod:heatthetestpieceto100°C,maintainatthistemperature(±10°C)foraperiodof60+15min.,andthencoolin–0stillairtoroomtemperature.Themethodofheatingislefttothediscretionofthemanufacturer.©BSI20095 BS4449:2005+A2:20097.2.3TensilepropertiesThespecifiedcharacteristicvaluesforthetensilepropertiesaregiveninTable4.Table4—CharacteristictensilepropertiesYieldstrength,ReTensile/yieldstrengthratio,Rm/ReTotalelongationatmaximumforce,AgtMPa%B500A5001.05a2.5bB500B5001.085.0B500C500W1.15,<1.357.5aR/Rcharacteristicis1.02forsizesbelow8mm.mebAcharacteristicis1.0%forsizesbelow8mm.gtValuesofRespecifiedarecharacteristicwithp=0.95.ValuesofRm/ReandAgtspecifiedarecharacteristicwithp=0.90.CalculatethevaluesofRmandReusingthenominalcrosssectionalarea.Theabsolutemaximumpermissiblevalueofyieldstrengthis650MPa.Foryieldstrength(Re),theupperyieldstrength(ReH)shallapply.Determinetheyieldstrength(Re)fromthe0.2%proofstrength(Rp0.2)ifayieldphenomenonisnotpresent.7.2.4Fatiguestrength7.2.4.1GeneralReinforcingbars,coilsanddecoiledproductsshallbesubjecttofatiguetesting.Whensubmittedtoaxialforcecontrolledfatiguetesting,usingastressratio(Ömin./Ömax.)of0.2,andstressrangeasgiveninTable5,testsamplesshallsurvivefivemillionstresscycles.Table5—FatiguetestconditionsBarsizeStressrangemmMPau16200>16,u20185>20,u25170>25,u32160>321507.2.4.2BarsandcoilsReinforcingbarsfromeachproductionsiteshallbesubjecttofatiguetesting,todeterminethefatiguecharacteristicsofaparticulargeometricalshapeandprocessroute.Thefatiguepropertiesforeachsteelgradeandprocessrouteshallbeestablishedatanapplicabletestinglaboratory,initiallybytestingsamplesselectedfromtheupper,middleandbottomoftheproductdiameterrange.Atleastonceayear,samplesshallbetestedfromdifferentbarsorcoilsofonediameterfromeachprocessroute.Testsamplesshallbeselectedsothatalldiametersforeachprocessrouteshallbetestedoverafive-yearperiod.7.2.4.3DecoiledproductDecoiledproducts,fromeachproductionsite,shallbesubjecttofatiguetesting.Initially,samplesshallbetakenfromeachproductionsitefromonedecoilingmachinetypefromthelargestdiameterproduced.Atafrequencyofatleastonceperyear,samplesofonediametershallbeselectedfortestfromeachproductionsite,fromonedecoilingmachine.Samplingshallbecarriedoutinsuchawaythatthecombinationofmaterialmanufacturingroute,typeofdecoilerandindividualmachinesarecoveredoverafive-yearperiod.6©BSI2009 BS4449:2005+A2:20097.2.4.4SamplingEachtestunitshallcomprisetentestspecimens.Foreachdiameter,fromeachtestunit,fivebarsshallbeselectedfortest.Thetestspecimensshallnotexhibitisolateddefectsthatarenotcharacteristicoftheproductfromwhichtheyareselected.7.2.4.5RetestsTheproductsshallbedeemedtoconformtothisstandardifallfivetestpiecesendurefivemillionstresscycles.Ifoneofthefivetestpiecesproducesavalidfailure,afurtherfivesamplesfromthetestunitshallbetested.Ifoneofthesefurthersamplesfailsthetest,thenthematerialshallbedeemednottoconformtothisstandard,andaninvestigationshallbecarriedoutandappropriateactionsshallbetaken.Ifallfivefurthertestpiecesendurefivemillionstresscycles,thenthematerialshallbedeemedtocomplywiththisstandard.Inthecaseofanyfailure,thetestshallbeconsideredinvalidifitisinitiatedfromadefectuniquetothetestpieceorintheareawithin2dofthetestingmachinegrips(wheredisthenominalbardiameter);inthiscaseafurthersingletestshallbecarriedout(seeBSENISO15630-1:2002).7.2.5BendperformanceBendperformanceshallbedemonstratedbymeansofthefollowingrebendtest.Bendthetestpiecesthroughanangleof90°,aroundamandrelwithadiameternotexceedingthosespecifiedinTable6,agethetestpieceandthenbendbackbyatleast20°.Afterthetest,thespecimenshallshownosignoffractureorcracksvisibletoapersonofnormalorcorrectedvision.Table6—MandreldiametersforrebendtestNominaldiameterd,mmMaximummandreldiameteru164d>167d7.3Dimensions,masspermetreandtolerances7.3.1Preferreddiameters,nominalcrosssectionalareaandmasspermetre#Therangeofnominaldiametersshallbe6mmto50mm.$NOTE1Thepreferredmillimetrenominaldiametersare8,10,12,16,20,25,32and40.NOTE2Ifabarsmallerthan8mmisrequired,therecommendeddiameteris6mm.NOTE3Ifabarlargerthan40mmisrequired,therecommendeddiameteris50mm.#Textdeleted$#NOTE4.WherecoilorbarissuppliedforthemanufactureofweldedfabrictoBS4483,thenpreferredmillimetrenominaldiametersshallinclude6,7and9.$NOTE5Ifcoilordecoiledproductsmallerthan8mmisrequired,therecommendeddiameteris6mm.ThevaluesforthenominalcrosssectionalareaandmasspermetreofpreferreddiametersshallbeasgiveninTable7.NOTE6Thevaluesforthenominalmasspermetrearecalculatedfromthevaluesofthenominalcrosssectionalareaonthebasisthatsteelshaveamassof0.00785kg/mm2permetrerun.©BSI20097 BS4449:2005+A2:2009Table7—Nominalcross-sectionalareaandmasspermetreNominaldiameterCrosssectionalareaMasspermetremmmm2kg6a28.30.2227a38.50.302850.30.3959a63.60.4991078.50.617121130.888162011.58203142.47254913.85328046.314012579.8650196315.4aPreferreddiametersforthemanufactureofweldedfabrictoBS4483only.7.3.2TolerancesThepermissibledeviationfromnominalmasspermetreshallbenotmorethan±4.5%onnominaldiametersgreaterthan8mm,and±6.0%onnominaldiameterslessthanorequalto8mm.7.3.3LengthThenominallengthofbarsshallbeagreedatthetimeofenquiryandorder.Thepermissibledeviationfromthenominallengthshallbe+100/–0mm;othertolerancesmaybeagreedatthetimeofenquiryandorder.7.3.4CoilmassThenominalcoilmassshallbeagreedatthetimeofenquiryandorder.7.4Bondstrengthandsurfacegeometry7.4.1GeneralRibbedbarsarecharacterizedbytheirsurfacegeometry,bymeansofwhichbondwiththeconcreteisachieved.Bondpropertyrequirementsofribbedreinforcingsteelsaccordingtothisstandardshallbebasedonsurfacegeometry,orbymeansofthebondtestprovidedinAnnexA;bondpropertyrequirementsbasedonsurfacegeometryarepreferred.Theassessmentcriteriaforthebondtestsshallbeasgivenintheappropriatedesigndocuments.Asuitablemeansoffactoryproductioncontrolbasedonthecontrolofsurfacegeometryshallbederivedfromthebondtestresults.NOTERequiredlevelsofbondstrength,asmeasuredinthebondtestinAnnexA,aregiveninBSEN1992-1-1:2004,AnnexC.7.4.2Surfacegeometry7.4.2.1GeneralRibbedsteelsarecharacterizedbythedimensions,numberandconfigurationoftransverseandlongitudinalribs.Bars,coilsanddecoiledproductsshallhavetwoormorerowsoftransverseribsuniformlydistributedaroundtheperimeter.Withineachrowtheribsshallbeuniformlyspaced.Longitudinalribscanbepresentornot.AnexampleofaribbedsteelisgiveninFigure1.8©BSI2009 BS4449:2005+A2:2009ABA-BahCFigure1—RibgeometryexamplewithtworowsoftransverseribsThevaluesforthespacing,heightandribinclinationoftransverseribsshallbewithintherangesgiveninTable8.Table8—RangesfortheribparametersRibheight,hRibspacing,cRibinclination,¶0.03dto0.15d0.4dto1.2d35°to75°ThecharacteristicrelativeribareashallmeettherequirementsofTable9.ThecharacteristicvaluesinTable9areforp=0.95.NOTEThemethodsforthecalculationofrelativeribareaaregiveninBSENISO15630-1:2002.Table9—CharacteristicrelativeribareaNominalbarsize,dRelativeribareammdu60.0356120.0567.4.2.2Transverseribs#Textdeleted$Theprojectionofthetransverseribsshallextendoveratleast75%ofthecircumferenceoftheproduct,whichshallbecalculatedfromthenominaldiameter.Thetransverseribflankinclinationµshallbegreaterthanorequalto45°,andthetransitionfromtheribtothecoreshallberadiused.7.4.2.3LongitudinalribsWherelongitudinalribsarepresent,theirheightshallnotexceed0.10d,wheredisthenominaldiameteroftheproduct.©BSI20099 BS4449:2005+A2:20098Evaluationofconformity8.1Routineinspectionandtesting8.1.1GeneralReinforcingsteelsshallbeproducedunderapermanentsystemofroutineinspectionandtesting,whichshallincludeevaluationofspecifiedproperties,asdescribedin8.1.2and8.1.3.8.1.2Samplingandtestingoffinishedproducts8.1.2.1VerificationofstandardpropertiesFortheverificationofstandardproperties,samplingandtestingshallbeasspecifiedin8.1.2.2and8.1.2.3.8.1.2.2BarsandcoilsThetestunitshallbethecastorpartquantityofthecast.Therateoftestingshallbeasfollows.a)Forchemicalcomposition,oneanalysispertestunit.Thechemicalcomposition(castanalysis)ofthesteelshallhavebeendeterminedbythesteelproducer.b)Forrebendtests,nominalmasspermetreandsurfacegeometry,onetestpiecepertestunitandnominaldiameter.c)Fortensiletests,onetestpieceper30twithatleastthreetestpiecespertestunitandnominaldiameter.Wherebarsandcoilsareproducedforthemanufactureofweldedfabriconly,onetensiletestpieceshallbetakenper30tproduced.Testresultsshallbeevaluatedinaccordancewith8.1.3.8.1.2.3DecoiledproductsTheprocessorofproductsincoilshallensurethatthedecoiledproductscontinuetomeetthespecifiedpropertyrequirementsoftheappropriategrade.Inspectionandtestingofdecoiledreinforcingbarsshallincludeasaminimum:a)visualinspectionforsurfacegeometrydamageofeverycoilprocessed;b)surfacegeometrymeasurementonatleastonesampleperdayandproducedsize;c)tensiletestingatafrequencyofatleastonesamplepermachinetype(rollerorspinner)perweekfromeachoftwoprocessedsizes.Thesamplingshallbesuchthatallmachinesandsizesarecoveredinasix-monthperiod.Onlyonesampleshallbetakenfromeachcoil.Testingmaybecarriedouteitherbytheprocessorusingitsownresources(internalorexternal)orbytheprocessorinco-operationwiththecoilmanufacturer.Thetestsshallnotbeseenasreleasetests,butasthebasisfortheassessmentofthelong-termqualitylevel(LTQL)asdescribedin8.2.8.1.3Evaluationoftestresults8.1.3.1Tensileproperties8.1.3.1.1WherethecharacteristicvalueCvisspecifiedasalowerlimit,theresultsshallbedeemedtoconformtothisstandardifeither:a)allindividualvaluesaregreaterthanorequaltothespecifiedcharacteristicvalueCv;orb)xWCv+a1wherea1is10MPaforRe,zeroforRm/Reand0%forAgt,andallindividualvaluesaregreaterthanorequaltotheminimumvaluesgiveninTable10.10©BSI2009 BS4449:2005+A2:2009Table10—AbsoluteminimumandmaximumvaluesoftensilepropertiesPerformanceMinimumvalueMaximumvaluecharacteristicB500AB500BB500CB500AB500BB500CRe,MPa485485485650650650R/R1.03a1.061.13N/AN/A1.38meA,%2.0b4.06.0N/AN/AN/Agta1.01forsizesbelow8mm.b0.8%forsizesbelow8mm.8.1.3.1.2WherethecharacteristicvalueCvisspecifiedasanupperlimit(i.e.forRm/ReofgradeB500C),theresultsshallbedeemedtoconformtothisstandardifeither:allindividualvaluesofRm/Reareequaltoorlowerthanthespecifieduppercharacteristicvalueof1.35;orc)xu1.35forRm/ReandallindividualvaluesforRm/ReareequaltoorlowerthanthemaximumvaluegiveninTable10.8.1.3.2Bendperformance,geometry,masspermetreIntherebendtest,alltestpiecesshallfulfiltherequirementsof7.2.5.Iftestingthesurfacegeometry,theresultsshallmeettherequirementsof7.4.Iftestingthemasspermetre,noindividualvalueshallbeoutsidethetolerancesspecifiedin7.3.2.8.1.3.3RetestsIfanytestspecimenfailstomeettheyieldstrength,tensile/yieldstrengthratio,totalelongationatmaximumforce,rebendorribgeometryrequirements,twoadditionaltestspecimensshallbetakenfromdifferentbarsofthesamebatchtoundergotests.Ifbothadditionaltestspecimenspasstheretests,thebatchshallbedeemedtoconformtothisstandard.Ifeitheroftheadditionaltestspecimensfailstheretests,thebatchshallbedeemednottoconformtothisstandard.8.1.4TraceabilityandtestreportsDeliveredbatchesshallbeidentifiableandtraceabletothemanufacturerandtotheirproductiondata.Themanufacturershallestablishandmaintaintherecordsrequiredandshallidentifytheproductsandtheirdeliverydocumentationaccordingly.Foreachdelivery,manufacturersshallsupplythefollowinginformation:a)thecastnumberandcastanalysis,includingallspecifiedelementsandelementsusedforthecalculationofthecarbonequivalentvalue;b)thecarbonequivalentvalue;c)theresultsofthetensileandrebendtests;d)themasspermetre;e)themanufacturingprocessroute;andf)therolledonmillmark.8.2Assessmentofthelongtermqualitylevel8.2.1MaterialproducedunderathirdpartyproductcertificationschemeTheresultsoftestsonalltestunitsofcontinuousproductionshallbecollatedandstatisticallyevaluatedforRe,Agt,andRm/Re,takingeitherthenumberofresultscorrespondingtotheprecedingsixmonths’operationorthelast200results,whicheveristhegreater.©BSI200911 BS4449:2005+A2:20098.2.2Determinationofthelong-termqualitylevelTheevaluationshallbecarriedoutpernominaldiameter.ThefollowingrequirementshallbesatisfiedforRe,AgtandRm/Re:x–ksWCvwherexistheaveragevalue;sistheestimateofthestandarddeviationofthepopulation;kisthecoefficientlistedinTable11forReandinTable12forAgtandRm/Re;Cvisthespecifiedcharacteristicvalue.Theforegoingisbasedontheassumptionthatthedistributionofalargenumberofresultsisnormalbutthisisnotarequirementofthisstandard.However,thefollowingalternativemethodsmaybeusedtoestablishconformityoftheproductionwiththerequirementsofthisBritishStandard:a)graphicalmethodsincludingcontrolcharts;b)non-parametricstatisticaltechniques.8.2.3MaterialnotcoveredbyathirdpartyproductcertificationschemeMaterialnotcoveredbyathirdpartyproductcertificationschemeshallbeassessedbyacceptancetestsoneachbatch(seeAnnexB).Table11—Coefficientkasafunctionofthenumbernoftestresults(forareliablefailurerateof5%[p=0.95]ataprobabilityof90%)nknk53.40302.0863.09402.0172.89501.9782.75601.9392.65701.90102.57801.89112.50901.87122.451001.86132.401501.82142.362001.79152.332501.78162.303001.77172.274001.75182.255001.74192.2310001.71202.21Z1.6412©BSI2009 BS4449:2005+A2:2009Table12—Coefficientkasafunctionofthenumbernoftestresults(forareliablefailurerateof10%[p=0.90]ataprobabilityof90%)nknk52.74301.6662.49401.6072.33501.5682.22601.5392.13701.51102.07801.49112.01901.48121.971001.47131.931501.43141.902001.41151.872501.40161.843001.39171.824001.37181.805001.36191.7810001.34201.77Z1.289TestmethodsThetensiletestforthedeterminationofRe,Rm/ReandAgt,therebendtest,theaxialloadfatiguetest,themeasurementofthesurfacegeometryandthedeterminationoftherelativeribareafR,thedeterminationofdeviationfromnominalmasspermetreandthemethodsforchemicalanalysisshallbeinaccordancewithBSENISO15630-1:2002.SeealsoTable3.NOTEFortherebendtest,itisrecommendedthatthebendingrateisapproximatelythreerevolutionsperminute.10Identification10.1GeneralEachreinforcingsteelshallhaveidentificationmarkstoidentifythemanufacturer,accordingtotherequirementsofAnnexC.WhereCEmarkingisrequired,productmarkingshallbeinaccordancewithBSEN10080:2005.©BSI200913 BS4449:2005+A2:200910.2IdentificationofsteelgradeThesteelgradeshallbeidentifiedbytheproduct’ssurfacefeatures(arrangementofthetransverseribs)asfollows:GradeB500A:barsshallhavetwoormoreseriesofparalleltransverseribswiththesameangleofinclinationandthesamedirectionforeachseries.AnexampleofribpatternofgradeB500AwithfourtransverseribseriesisgiveninFigure2.Figure2—ExampleofribpatternforgradeB500AGradeB500B:barsshallhavetwoormoreseriesofparalleltransverseribs.Forbarswithtwoorthreeribseries,oneoftheseriesshallbeatacontraryangletotheothers;andforbarswithfourribseries,twooftheseriesshallbeatacontraryangletotheothers.AnexampleofribpatternofgradeB500BwithfourtransverseribseriesisgiveninFigure3.Figure3—ExampleofribpatternforgradeB500BGradeB500C:barsshallhavethesamearrangementofribseriesasforB500B.However,ineachribseries,theribsshallalternatebetweenahigherandloweranglewithrespecttothebaraxis.Thedifferencebetweentheanglesofthedifferentribsandthebaraxisshallbeatleast10°.AnexampleofribpatternofgradeB500CwithtwotransverseribseriesisgiveninFigure4.Figure4—ExampleofribpatternforgradeB500C14©BSI2009 BS4449:2005+A2:200911Verificationofpropertiesinthecaseofdispute11.1Mechanicalproperties11.1.1Wheneverthedeterminationofapropertyspecifiedinthisstandardasacharacteristicvaluecreatesadispute,thevalueshallbeverifiedbyselectingandtestingthreetestpiecesfromvariouspiecesfromthebatchunderexamination.Ifonetestresultislessthanthespecifiedcharacteristicvalueboththetestpieceandthetestmethodshallbecarefullyexamined.Ifthereisalocalfaultinthetestpieceorreasontobelievethatanerrorhasoccurredinthetest,thetestresultshallbeignored.Inthiscaseafurthersingletestshallbecarriedout.Ifthethreevalidtestresultsareequaltoorgreaterthanthespecifiedcharacteristicvalue,thebatchshallbedeemedtoconformtothisstandard.Ifnot,therequirementsof11.1.2apply.11.1.2If11.1.1isnotfulfilled,10additionaltestpiecesshallbeselectedfromdifferentbars,coilsordecoiledproductsinthebatch.Thebatchshallbedeemedtoconformtothisstandardiftheaveragetestresultofthe10testpiecesishigherthanthecharacteristicvalueandtheindividualvaluesarehigherthantheminimumandlowerthanthemaximumvaluesgiveninTable10.Ifnotthebatchisrejected.11.1.3Wheneverthedeterminationofrebendcharacteristicsisacausefordispute,theyshallbeverifiedbyselectingandtestingthreespecimensfromdifferentbars,coilsordecoiledproductsinthebatch.Ifallthreespecimenspassthetests,thebatchshallbedeemedtoconform,otherwisethebatchshallbedeemednottoconformtothisBritishStandard.11.2ProductanalysisIfduringproductanalysis,asinglesamplefallsoutsidethemaximumdeviationlimitsforthecompositionrangeofaspecifiedelement,giveninTable2,furthersamplesshallbeselectedfromtheremainderofthebatchasfollows:a)atleasttwosamplesfromthesamecastfordeliveredmassesupto5t;b)atleastfivesamplesfromthesamecastfordeliveredmassesupto20t;c)atleasteightsamplesfordeliveredmassesover20t.IfanyofthefurthersamplesanalysedfalloutsidethemaximumproductanalysislevelsgiveninTable2foranyelement,thebatchshallbedeemednottoconformtothisstandard.©BSI200915 BS4449:2005+A2:2009AnnexA(normative)Bondtestforribbedreinforcingsteel—BeamtestA.1IntroductionThisannexdescribesamethodfortestingthebondcharacteristicsforribbedbarsanddecoiledproductstobeusedasreinforcingsteelinconcretestructures.Thebeamtestisintendedtodeterminethebondofreinforcingsteelandistoserveasabasisforthecomparisonofreinforcingbarsanddecoiledproductsofapproximatelythesamebarordecoiledproductdiameterbutwithdifferentsurfaceconfigurations.Thetestmethodisapplicableforreinforcingsteelindiametersu32mm.NOTEThemethodisbasedontheRILEM-RecommendationRC5,Bondtestforreinforcementsteel[1].A.2PrincipleofthetestAtestbeamisloadedbysimpleflexureuntilcompletebondfailureofthereinforcingsteeloccursinbothhalf-beamsoruntilthereinforcingsteelitselffails.Duringloading,theslipofthetwoendsofthereinforcingsteelismeasured.Thebeamusedforthetestconsistsoftwoparallelepipedalreinforcedconcreteblocksinterconnectedatthebottombythereinforcingsteelofwhichthebondistobetested,andatthetopbyasteelhinge.Thedimensionsofthetwoblocksandthehingesaredeterminedbythediameterofthereinforcingsteeltobetested.ThetestisillustratedinFigureA.1,FigureA.2,FigureA.3andFigureA.4.Thedimensionsofthetestbeamsdependonthenominaldiameterofthereinforcingsteelforwhichthebondistobedetermined.Fornominaldiameterslessthan16mm,abeamspecimenoftypeAisusedandfornominaldiametersequaltoorlargerthan16mm,abeamspecimenoftypeBisused(seeFigureA.3andFigureA.4).NOTEExperienceoftestingbarswithdiameterslargerthan32mmislimited.Tousethetestmethodofthisannexforsuchlargediameters,atypetestingprogramshouldbeperformedtoevaluatetheapplicabilityofthetestmethod.Dimensionsinmm202045˚601560˚190Key1width=100mmFigureA.1—DimensionsofthehingeforbeamtypeA(d<16mm)16©BSI2009 BS4449:2005+A2:2009Dimensionsinmm202045˚802060˚1100Key1width=150mmFigureA.2—DimensionsofthehingeforbeamtypeB(dW16mm)DimensionsinmmP/2P/215012310030d10018050450LL10dL50L10d375375650Key1Slipmeasuringdevice2Steelhinge3Plasticsleeves4MovablesupportFigureA.3—BeamtesttypeA(d<16mm)©BSI200917 BS4449:2005+A2:2009DimensionsinmmP/2P/2200211503d150402405004LL10dLL10d5600606001100Key1Slipmeasuringdevice2Steelhinge3Plasticsleeves4MovablesupportFigureA.4—BeamtesttypeB(dW16mm)A.3SamplesandspecimensIfvarioussizesofthesametechnicalclassofreinforcingsteelandthesamesurfaceconfigurationaretobetested,theymaybegroupedintoseries.Alldiameterswithinagroupshallhavethesameconfigurationwithregardtoribs.AsuitablegroupingisshowninTableA.1.NOTETohavethesamesurfaceconfigurationimpliesthattherelationshipbetweenribheight/bar-or-decoiledproductdiameterandribspacing/bar-or-decoiledproductdiameteraswellastheribinclinationisthesame.TableA.1—SeriesofreinforcingsteeldiametersfortestingofbondRangeofnominaldiameters,RepresentativenominalDenominationoftheseriesddiameteroftheseriesmmmmSmalldiametersdu108Mediumdiameters10